Ludwig Precision 48" Heavy-Duty Aluminum T-Square, 82148 48-inch length 2-Inch wide x 2.3-Millimeter thick extruded aluminum blade Broad and solidly built black plastic head is 14-inch wide and is calibrated to 5-inch on each side of the blade Inch and Centimeter calibrations allow for flexible use in any situation Large printed numbers make for fast and easy to read Measurements